Couch, Leon W.. Digital and Analog Communication System / Textual Documents Leon W.Couch. - 6th ed. / - Delhi : Pearson Education , ©2001. - xv,758p. ; 22cm. Index ISBN: 81-7808-328-0 Subjects--Index Terms: Communication System-Digital and Analog Deptt.-Physics Dewey Class. No.: 537.5 / Co 83 Di